Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Maritime War, and Preparations for Crossing to Asia - Polyxenidas and Pausistratus - Engagement off Aspendus - Battle of Myonnesus
A more serious war was impending in Asia--a war which appeared of a very hazardous character on account not so much of the enemy as of the great distance and the insecurity of the communications with home, while yet, owing to the short-sighted obstinacy of Antiochus, the struggle could not well be terminated otherwise than by an attack on the enemy in his own country. The first object was to secure the sea.
The Roman fleet, which during the campaign in Greece was charged with the task of interrupting the communication between Greece and Asia Minor, and which had been successful about the time of the battle at Thermopylae in seizing a strong Asiatic transport fleet near Andros, was thenceforth employed in making preparations for the crossing of the Romans to Asia next year and first of all in driving the enemy's fleet out of the Aegean Sea.
It lay in the harbour of Cyssus on the southern shore of the tongue of land that projects from Ionia towards Chios; thither in search of it the Roman fleet proceeded, consisting of 75 Roman, 24 Pergamene, and 6 Carthaginian, decked vessels under the command of Gaius Livius. The Syrian admiral, Polyxenidas, a Rhodian emigrant, had only 70 decked vessels to oppose to it; but, as the Roman fleet still expected the ships of Rhodes, and as Polyxenidas relied on the superior seaworthiness of his vessels, those of Tyre and Sidon in particular, he immediately accepted battle.
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp?pg=24